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WTB RGB SCART to YUV Converter

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xodaraP

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Hi guys,
Looking for a RGB SCART to YUV converter as my TV doesn't have SCART inputs but it does have component. It has a beautiful picture so I really don't want to get rid of it and it unfortunately can't be RGB modded (I've been down that road and actually attempted it) - I've tried building a couple of the DIY converters around and they haven't worked either.

Would prefer not to buy one of the CSY-2100 clones as while I know they work, I also know they're not the best. I was hoping one of our UK members might have one of the JS-Technology converters that they're no longer using and might wish to sell. There was one on ebay a few weeks ago but I missed it :( there's a JS-Technology converter for component -> RGB and I almost bought that until I realised it's the wrong direction.

This is the JS Technology converter: http://www.js-technology.com/store/product.php?id_product=14

Let me know if you have something available :)
 
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Maybe a bit off topic, but would RGB 2 VGA and VGA 2 HDMI be a possible option? RGB 2 VGA is just a matter of separating the sync signal.
There are some pretty cheap VGA 2 HDMI (mini) converters on the market.
The only thing I don't know is the latency those might generate. Maybe your screen already supports VGA in?
 
I've tried a similar BA7230LS based circuit and it didn't work but I'm always happy to try it :) how is it powered? And is it designed to be standalone or installed into a device for component output?
 
I've got the following parts in my stash:

1 BA7230LS
1 IC LM1881N
1 Ceramic Capacitor 10 pF
4 Ceramic Capacitor 100nF (104)
2 Electrolytic Capacitor 10uF
1 Electrolytic Capacitor 100uF
3 Electrolytic Capacitor 220uF

I've got all these in TH but I reckon SMD will be better:

1 39R Resistor
6 75R Resistors
2 150R Resistors
3 470R Resistors
2 820R Resistors
1 2K2 Resistors
2 5K6 Resistors
3 10K Resistors
1 680K Resistor
2 Trimpots from 1K up to 2K

These parts I don't have on hand but they're easy enough to order:

3 Ceramic Capacitor 1uF (105)
2 1N4148 Diodes
3 Transistors BC547 (or BC548 or BC549)
2 Transistors BC557 (or BC558 or BC559)
 
Re resistors in SMD, I have:

75R
150R
470R
820R
2K2
680K

Plus have the 1K trimmers.

Not much left to source.
 
Power can be derived from scart so no external power needed.

Reading his notes, this is the circuit you originally tried done correctly. As in he amplifies the video signal rather than just boosting the voltage.
 
It looks like they installed it direct into consoles, but I'm definitely happy to give it a shot, if it doesn't happen then I'll go for the Shinybow.

I've emailed ani-av to see if they'll ship to Australia (there's an eBay store that does but it uses the Worldwide Shipping Program so crazy expensive)
 
Frank_fjs said:
Power can be derived from scart so no external power needed.

Reading his notes, this is the circuit you originally tried done correctly. As in he amplifies the video signal rather than just boosting the voltage.
Click to expand...
If you're happy to make up the PCB design let's go for it, worst that happens is it needs to be installed into a console and I'll find a use for it :)
 
Let's do it. We always wanted to make our own.

I'd still be chasing a Shinybow though if I were you, solid piece of equipment that you'll always find a use for.
 
Yeah I'll wait and see if ani-av gets back to me, I'm not paying $100 in postage for a $120 product (ani-av also sells it cheaper than the eBay store)
 
I wouldn't power it from the scart as that only has a supply voltage of 6V or 12V indicating it's outputting video in 4:3 mode or 9:6 widescreen mode. Most devices can't deliver much current from that signal. If you are designing a pcb, provide a separate power input you can use to connect a cheap 5V or 12V adapter (haven't checked what you need). You could use the scart voltage to turn off the circuit supply when there is no video signal. (It might make the system a little more environmental friendly.)
 
The pin is used to make tv set's switch automatically to the scart RGB signal and to make it switch automatically to widescreen mode.

While maybe some consoles have it tied to 5V, it's not guaranteed to have 5V

Besides that, if the console has a way to select normal or widescreen mode, it might switch that voltage from 5V to 10 - 12V.

I used it to power only an LM1881 and it already dropped to 4.5V with the load of that chip (og xbox rgb scart cable)

So if you intend to make something universal, power it with an external adapter. They are only 5 euro nowadays.
 
Wow, surprised at that voltage drop.

I've measured my Mega Drive and it outputs a full 5V, but you're right, who knows what other consoles are doing.

External power is easy enough to incorporate, maybe I'll utilise a switch to allow alternating between scart power or external.
 
A low voltage drop schottky diode could do the job. You have those dual diode types (like used in pc supplies) with 2 anodes and a common kathode. You can apply voltage to either one of the anodes... (Obvious you don't need a type that can handle multiple amps.)
 
Frank_fjs said:
Power can be derived from scart so no external power needed.

Reading his notes, this is the circuit you originally tried done correctly. As in he amplifies the video signal rather than just boosting the voltage.
Click to expand...
I really recommend a good 5V external psu, or, use a voltage regulator like 7805 into the circuit.
 
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